While the significance of the infinite-dimensional enhancement of the anti-de Sitter algebra takes a natural place in the context of the AdS/CFT correspondence [1]}, [2]}, the physical implications of the infinite-dimensional BMS algebra are still a subject of intense study (see [3]} for earlier work, [4]}, [5]}, [6]} for an intriguing extension of the formalism to include super-rotations, and [7]} for review and references to the more recent exciting developments that triggered the current activity).
